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Thanks for suggestion. I will purchase one and move ahead. Thanks again.

Thanks mike for the suggestion . I will use the oscilloscope to figure out ripples in my circuit.

However i have used the zener (D1) as 25 volts to reduce the input voltage across the capacitor as ...

You calculate the reactance of the capacitor so you then know what the total equivalent resistance in the AC line is. Then with the load current you can calculate the AC voltage that will be present ...

Thanks for suggestions guys .

If the power for the PIC and the ADC test supply are not tied together, you can get 'ground loops' and BIG variations in voltage levels.

Temtronic, The DC powe ...

Thanks Temtronic

This is my initial arrangement. I am strictly focusing on power PIC using Transformerless AC To DC Converter. And then I am using another 5v DC Source, 1 K ohm POT (To vary from 0- ...

Yes I am. But I am using an OPAMP as differential amplifier and it’s output to determine ADC using PIC.

Am I going wrong way ? Please suggest.

Ttelmah,

Thanks for the reply. I realized my mistake, I have already corrected the code. My output is constant 1.001v dc.

You are right again. When I try to power PIC using 5v DC power source i ...

I am using PIC16F914 with 20.0000 MHz crystal for reading the voltage input for a voltmeter application. I am using a custom LCD with that to display the raw ADC values of voltage input. I am using PC ...

I have modified my code and it works. I just made following changes. I think it needs more delay to set the capture_flag = False. As soon as i increased the value of capture_interrupt count to 60, i a ...

PCM Programmer,

I have tried the recommended code, but the problem still persists. I am sending the updated piece of code. The lcd displays as soon as the input signal is present but does not displ ...

Yes without any output from function generator in beginning I am getting zero. But once it detects 0.5 MPH it remains same even if I am removing the signal input from function generator.

The old ...

YES old code works fine in old hardware compiled in same compiler (version 5.074) but it doesnot work in new hardware . any ways the problem is solve but i need some idea how to make an LCD Display ...

I have wrote a simple code. it is working now but there is a problem. I am giving 37 Hz Input and getting 0.5 Mph on LCD. But as the freq input to CCP (turning off output of function generator) the d ...

Ttelmah it is working fine. It counts from 0 to 999. Without missing any digit. Works 100%

Here is a piece of my modified code !!

void counter()
{
if(seconds >=1)
...

Temtronic i have RB0, RB1 I/O pins available. What exactly you want me to test ? I need little more explanation.